解题方法
1 . 已知函数
,
.
(1)讨论
的单调性;
(2)判断是否存在
,使得
的最小值为
.若存在,确定符合条件的
的个数;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9999bb8c3531465eb89996cf9d4fbb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7691c512d7e7840bf1e3a4549fba2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89db4fb79d39ee89c70fcf94b5402632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 一条直线与另外两条异面直线同时垂直且相交,则称该直线是两条异面直线的公垂线,并把以两垂足为端点的线段称为两异面直线的公垂线段,公垂线段的长度则被称为两异面直线之间的距离.
(1)用符号语言表述公垂线、公垂线段及两异面直线之间的距离的定义.
(2)证明:两条异面直线的公垂线有且仅有一条.
(3)在空间直角坐标系
中,直线
过点
,方向向量
;直线
过点
,方向向量
,试问:
与
是否共面?
Ⅰ.若共面,
(ⅰ)求
与
交点
的坐标.
(ⅱ)已知
,记
与
所确定的平面为
,记
与
所确定的平面为
,若
,试问:
是否确定?若确定,求出
的单位方向向量;若不确定,请说明理由.
Ⅱ.若异面,
(ⅰ)请给出证明.
(ⅱ)
为
与
的公垂线,
,求
与
之间的距离
.
(ⅲ)求
.
(1)用符号语言表述公垂线、公垂线段及两异面直线之间的距离的定义.
(2)证明:两条异面直线的公垂线有且仅有一条.
(3)在空间直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e336d6ca2cae3d6e6c3810d7e521a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66fee2d6c70b7b196dfc3b51aea3955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9745750b928aa220e745f65e1dc556ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9a2ba51dc2d8af0dbf9ffb8ab4a03b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced9c0010666356afff5e2f6fec175a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
Ⅰ.若共面,
(ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c9eb310d9d90592d7ea635e3e06bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
Ⅱ.若异面,
(ⅰ)请给出证明.
(ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303afed975262b38bf1ce765f733a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(ⅲ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e723e57753f0a4fe1ef8ca1aee0e2117.png)
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名校
解题方法
3 . 如图,在四棱锥
中,底面
为直角梯形,
,
,平面
平面
.
;
(2)求平面APB与平面
夹角的余弦值;
(3)在棱
上是否存在点
,使得
平面
?若存在,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07cf995d64820e4900e8a88bcfe2d0b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3cbb0e21389791a038f7a9ce6a327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfdeca63dbaeeb02f740c6de286aef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(2)求平面APB与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0492b25f10ae45c39f8e9838519259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b505e0df1131e3a93fc81d13f6e224e7.png)
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解题方法
4 . 如图,在四棱锥
中,底面ABCD是正方形,侧面PAD是等腰三角形,且
,侧面
平面ABCD.
(2)设
,在线段PD上是否存在一点Q,使得
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9300bfac2806ffc211a19d9b7317e9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760d5434e6c8bf40ea411cb2009fd752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff82dc4f9daf2658ee50f550ffdeac58.png)
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解题方法
5 . 已知
为等差数列,前
项和为
,若
,
;数列
满足:
,
.
(1)求
和
的通项公式;
(2)对任意的
,将
中落入区间
内项的个数记为
.
(i)求
;
(ii)记
,
的前
项和记为
,是否存在
,
,使得
成立?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc5ee307edf4fb61a0820ebebffd48c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39cae39a8e0a8a9f8e9929603e3303c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6b18b109a656b62fb173680ae99ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0df4a5aaca41fb8a04abfd8e2c6fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ab8dbdcb039662a5bdbb9070c10a62.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829442c6473c94fde041595bc18530d7.png)
(ii)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3261a0431ba2ec032e74520024f0e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463195d16c135c5aea8fc05fa74a5273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e74be91bfe4bc209da7539dbf9b72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6b6467f94bbc9916e47bade380929b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7bd3bd01a3b58d51b643cbdb00adf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d8305fb797b03cab3ba6059c518d14.png)
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6 . 祖暅是我国南北朝时期杰出的数学家和天文学家祖冲之的儿子,他提出了一条原理:“幂势既同,则积不容异”,这里的“幂”指水平截面的面积,“势”指高.这句话的意思是:两个等高的几何体若在所有等高处的水平截面的面积相等,则这两个几何体体积相等.利用祖暅原理可以将半球的体积转化为与其同底等高的圆柱和圆锥的体积之差.如图1是一种“四脚帐篷”的示意图,其中曲线AOC和BOD均是以
为半径的半圆,平面AOC和平面BOD均垂直于平面ABCD,用任意平行于账篷底面ABCD的平面截帐篷,所得截面四边形均为正方形.模仿上述半球的体积计算方法,可以构造一个与帐篷同底等高的正四棱柱,从中挖去一个倒放的同底等高的正四棱锥(如图2),从而求得该帐篷的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 正项数列
满足:对于
,其中
为非零常数,则称数列
为平方等差数列.记
.
(1)判断无穷数列
和
是否是平方等差数列,若是求出
,若不是,说明理由;
(2)若
是平方等差数列且
,证明:任意的正常数
,存在正整数
,使得
;
(3)若
是平方等差数列,
,令
是不大于
的最大整数,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f4fb301b1cc7b26989dc0155265ce8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e680f28daa101a42903ef44cf6e6894a.png)
(1)判断无穷数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79846a75b58202231ea77b48cc762ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d902a97c66132fa8cbede383c72a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7557aa06d3c4f96202a07eff08bf11f9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3fb03837fc6a4a47e2e9b08314bb2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2dc7120fdaaa3945c8cfbc60986d90.png)
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解题方法
8 . 某企业的设备控制系统由
个相同的元件组成,每个元件正常工作的概率均为
,各元件之间相互独立.当控制系统有不少于k个元件正常工作时,设备正常运行,否则设备停止运行,记设备正常运行的概率为
(例如:
表示控制系统由3个元件组成时设备正常运行的概率;
表示控制系统由5个元件组成时设备正常运行的概率).
(1)若
,且每个元件正常工作的概率
.
①求控制系统中正常工作的元件个数X的分布列和期望;
②在设备正常运行的条件下,求所有元件都正常工作的概率.
(2)请用
表示
,并探究:在确保控制系统中元件总数为奇数的前提下,能否通过增加控制系统中元件的个数来提高设备正常运行的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ae98886e48851f1778b6b1eea3306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f260c8bc16d2564b65309a57a860053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe0f61ec213734b7ae080719fa5cdd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b21b872313f7d8c5b606981f954a1e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74b0aa7a6f6dcab7d9101b98504ae2a.png)
①求控制系统中正常工作的元件个数X的分布列和期望;
②在设备正常运行的条件下,求所有元件都正常工作的概率.
(2)请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe0f61ec213734b7ae080719fa5cdd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2162cc424a094d06735529eccdb0f0e4.png)
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9 . 设
都是不小于3的整数,当
时,
,设集合
,如果
与
不能同时成立,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8053962df6842c6f7ba22e22b248a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360968942a1c8d3230458cb9831d2547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d720ffb5c894122b7e3cf28ac422d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290a82af12cd3fc223454a3564628072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff1cb3ef833aa0f3275497eca26b25f.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() |
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解题方法
10 . 人脸识别是基于人的脸部特征进行身份识别的一种生物识别技术.主要应用距离测试样本之间的相似度,常用测量距离的方式有3种.设
,
,则欧几里得距离
;曼哈顿距离
,余弦距离
,其中
(
为坐标原点).
(1)若
,
,求
,
之间的曼哈顿距离
和余弦距离
;
(2)若点
,
,求
的最大值;
(3)已知点
,
是直线
上的两动点,问是否存在直线
使得
,若存在,求出所有满足条件的直线
的方程,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e683a82b44bd6747960200db908b30b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093c6d5bcaa69cea79b24688f5d1bd97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2076597f52dacb28baf08028ea1301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a64216f67ac2493d05f8af3d5fcca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99ce0fdd3a34df8d5e913b7b9f6f3fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1460089da7b56806bc9b8776c9c5149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4a2681390214200443ae07c01a4abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8be2157ce1d0af226cfb7163d958c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bea681006f614f8a070e9c6a942c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df9aabd7dbfb1bb2b8d4ca6cd3562769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f11aeb1ae3e0698acd35dbcdf6098c7.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4c1b30e76bd2371bd0409143c834d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a368cbdca4871ef3528b0a91775eb9ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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